[ exp(5/23)*n! ].

Terms

a(0) =1a(1) =2a(2) =7a(3) =29a(4) =149a(5) =894a(6) =6263a(7) =50110a(8) =450998a(9) =4509982a(10) =49609809a(11) =595317717a(12) =7739130327a(13) =108347824587